Perforating-shear.



G. CARLTON. PERI'ORATING SHEAR. APPLICATION FILED 001220, 1908.

968, 1 21 Patented Aug. 23, 1910;

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UNITED STATES PATENT OFFICE.

CORTLAND CARLTON, OF KANSAS CITY, MISSOURI.

PERFORATING-SHEAR.

To all whom it may concern:

Be it known that I, CORTLAND CARLTON, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Perforating- Shears; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to a perforating shear and more particularly to an apparatus of that class for use with printing presses.

The mechanical perforators in use at the present time are usually of two types, one comprising a series of pins by which per forations are punched into the sheets or blanks, the other comprising cooperating rollers, the surface of one of which is flat, and the other provided with a knife edge adapted for intermittently cutting a sheet passing between the knife edge and the flat roller.

With perforating machines of either construction, when the perforation is punched into the paper the sheet is left in a rough and uneven condition, and in the apparatus using the roller the knife edge of the cutting rollers becomes dulled after a continued use, so that a clean cut is not made and imperfect results consequently ensue.

It is the object of my invention to provide a perforating apparatus having a shearing action, that is, an action in which the cutting blade engages the sheet progressively, with the engagement of the blade with the sheet commencing at one end of the blade and progressing gradually toward the opposite end to produce a cutting, rather than a punching operation, and in accomplishing this object I prefer the construction illustrated in the drawings for the reason that it also furnishes a. cushion for the cutting blade.

It is also an object of my invention to provide a resilient backing for the blade in order to produce a better cutting operation and to obviate damage to the parts.

It is also an object of my invention to provide the improved details of structure Specification of Letters Patent.

Application filed October 20, 1908.

Patented Aug. 23, 1910. Serial No. 458,691.

VI is an end view of the perforating blades in the position illustrated in Fig. III. Fig.

VII is a detail side view of one of the perforating blades. 7

Referring more in detail to the parts l designates a blade holder which is adapted for assembly in a printing chase and provided with end sockets 2, having the spring wells 3. Extending longitudinally through the body 1 and spring sockets 2, is a slot 4 which is preferably exposed at the front of the holder by cutting away the body 1 between the end sockets.

5 designates a perforating blade which is of such thickness that it may slide freely within the holder slot 4 and is beveled at its free edge to form the cutting portion 6 which is slotted transversely to provide the perforating teeth 6. Blade 5 is cut away at each end at the side opposite the cutting edge, to provide the spring seats 7 which are adapted for abutment against the springs 8 when the latter are posited in the socket wells 3.

The central body member 9 of the perforating blade is provided, at one side of its longitudinal center, with an opening 10, through which a pin 11, that is carried by the holder body 1, is adapted to project, the fit of the pin in said opening being such that the cutting blade is allowed a limited lateral play and a free pivotal movement thereon, and the pin and blade opening being so arranged that when the parts are assembled the springs 8 will be tensioned.

By pivoting the perforating blade at one side of its longitudinal center, a greater tension is placed on one of the springs 8 than on the other and the longer portion of the blade is extended outwardlybeyond the other to set the blade at an angle to the holder.

To adapt the apparatus for perforating lines at right angles to each other, I provide some, or all, of the blades with the end lips 12 which project outwardly from the body of the blade at the same angle as the bevel on the cutting edge, so that when the end of one blade is placed against the side of another, the lip 12 will overlap one side of the cooperating blade and provide a close union of the assembled parts.

To overcome dulling and injury to the blades I prefer to use a slightly resilient tympan in combination therewith, such tympan preferably comprising a face 13 of copper, or the like, and a rear face 14 of rubber, or like material, so that when the perforating blade is used in combination with such parts the cutting edge will work against the hard metal face, while the cushion at the rear of the face will yield slightly to compensate for possible improper mounting of the difierent parts.

lVith a perforating apparatus of this class the perforating blade holder 1 may be assembled in a printers chase, the cushioned tympan mounted in the manner usual with such parts, and the inking rollers removed from the press toprevent their injury by the perforating blades and afford the additional space required for the perforating parts.

The chase, so assembled, may be mounted in a printing press, and the latter operated in the ordinary manner, the perforating blades being moved toward and from the tympan to permit the sheets to be fed therebetween and the perforating operation to take place.

When the chase is moved toward the sheet, the extended end of the perforating blade first engages the sheet so that a small portion of its cutting edge cuts through the sheet at the first contact and, coming in contact with the metal tympan, is forced back against the tension of its spring as the chase moves toward the tympan, the blade yielding as the chase progresses and the contacting line of the blade and sheet gradually increasing in length as the blade is rocked on its pivot, until the blade is square with the tympan, when the pressure will be the same throughout the length of the blade and the entire blade will be moved backward, tensioning both of the springs 8 equally, such full movement being relative to the difference in diameter between the pin 11 and blade opening 10.

It is readily apparent that the gradually progressing contact provided by the arrangement of the perforating blade will resemble the action of a shear and that the perforations will be the result of a cutting rather than a punching action.

While I have referred to a printing press and to a chase for use therewith, such parts have not been illustrated as they are well known in the art and form no part of my present invention.

Having thus described my invention, what I claim as new therein and desire to secure by Letters Patent is 2 1. In a perforating shear, a blade holder, a. blade carried by said holder and adapted for movement relative thereto, a face member against which said blade is adapted to impinge, and springs, against the tension of which said blade is adapted to retreat when impinging against said face member.

2. In a perforating shear, a blade holder, a blade connected with said holder and adapted for rocking movement thereon, a face member against which the cutting edge of said blade is adapted to impinge, and a spring member located at each side of the blade and holder connection and acting outwardly on said blade.

3. In a perforating shear, a blade, having an eccentrically located aperture, a blade holder, having a pin projected into the blade aperture, and springs carried by said holder and pushing outwardly on said blade at each side of its connect-ion with said holder.

4. In a perforating shear, a blade holder, a blade carried by said holder and comprising a body portion and a cutting edge, the latter being provided with a lip that projects beyond the body member, at one end, and springs carried in the holder and engaging the blade.

5. A perforating shear comprising a blade holder, a perforating blade pivoted to said holder, and resilient members adapted for engagement with said blade at opposite sides of its pivotal point.

6. A perforating shear comprising a blade holder, a perforating blade pivoted to said holder, at one side of the longitudinal center of the blade, and a resilient member adapted for engagement with each end of said blade.

7. A perforating shear comprising a blade holder having a longitudinal blade slot, a perforating blade located in said slot, and resilient members adapted for partially controlling the action of said blade.

8. A perforating shear comprising a blade holder, having a suitable slot, a blade located in said slot and pivoted to said holder, and resilient members adapted for engagement with said blade.

9. A perforating shear comprising a blade holder provided with spring sockets and having a blade slot extending therethrough and through the spring sockets, springs located in said sockets, and a blade located in said slot, said blade being eccentrically pivoted to said holder between the spring sockets and adapted for movement against the tension of said springs.

10. In a perforating shear, the combination of a plurality of blade holders, arranged at right angles to each other and each provided with a blade slot and a perforating blade adapted for limited movement in said slot, one of said holders having a cut out portion adapted for exposing a part of its perforating blade and the opposite blade being provided with a tooth adapted for projection toward the cutting edge of the 6X- posed blade, substantially as and for the 10 purpose set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

CORTLAND CARLTON.

Witnesses:

MYRTLE M. JACKSON, E. A. CAHILL. 

